ちょうおんそく
超音速
1. supersonic speed
2. Supersonic speedSupersonic speed is a rate of travel of an object that exceeds the speed of sound. For objects traveling in dry air of a temperature of 20 °C (68 °F) this speed is approximately 343 m/s, 1,125 ft/s, 768 mph or 1,235 km/h. Speeds greater than five times the speed of sound (Mach 5) are often referred to as hypersonic. Flight during which only some parts of the air around an object, such as the ends of rotor blades, reach supersonic speeds are called transonic.
Read “Supersonic speed” on English Wikipedia
Read “超音速” on Japanese Wikipedia
Read “Supersonic speed” on DBpedia
Read “Supersonic speed” on English Wikipedia
Read “超音速” on Japanese Wikipedia
Read “Supersonic speed” on DBpedia
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